/* Get info from stack frames;
convert between frames, blocks, functions and pc values.
- Copyright (C) 1986, 1987, 1988, 1989 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1988, 1989, 1991, 1994, 1995, 1996, 1997
+ Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
-#include "param.h"
#include "symtab.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
#include "frame.h"
#include "gdbcore.h"
#include "value.h" /* for read_register */
#include "target.h" /* for target_has_stack */
+#include "inferior.h" /* for read_pc */
+#include "annotate.h"
-/* Required by INIT_EXTRA_FRAME_INFO on 88k. */
-#include <setjmp.h>
-#include <obstack.h>
-
-CORE_ADDR read_pc (); /* In infcmd.c */
-
-/* Start and end of object file containing the entry point.
- STARTUP_FILE_END is the first address of the next file.
- This file is assumed to be a startup file
- and frames with pc's inside it
- are treated as nonexistent.
-
- Setting these variables is necessary so that backtraces do not fly off
- the bottom of the stack. */
-CORE_ADDR startup_file_start;
-CORE_ADDR startup_file_end;
-
-/* Is ADDR outside the startup file? Note that if your machine
+/* Is ADDR inside the startup file? Note that if your machine
has a way to detect the bottom of the stack, there is no need
to call this function from FRAME_CHAIN_VALID; the reason for
doing so is that some machines have no way of detecting bottom
- of stack. */
+ of stack.
+
+ A PC of zero is always considered to be the bottom of the stack. */
+
int
-outside_startup_file (addr)
+inside_entry_file (addr)
CORE_ADDR addr;
{
- return !(addr >= startup_file_start && addr < startup_file_end);
+ if (addr == 0)
+ return 1;
+ if (symfile_objfile == 0)
+ return 0;
+#if CALL_DUMMY_LOCATION == AT_ENTRY_POINT
+ /* Do not stop backtracing if the pc is in the call dummy
+ at the entry point. */
+/* FIXME: Won't always work with zeros for the last two arguments */
+ if (PC_IN_CALL_DUMMY (addr, 0, 0))
+ return 0;
+#endif
+ return (addr >= symfile_objfile -> ei.entry_file_lowpc &&
+ addr < symfile_objfile -> ei.entry_file_highpc);
}
-/* Address of innermost stack frame (contents of FP register) */
+/* Test a specified PC value to see if it is in the range of addresses
+ that correspond to the main() function. See comments above for why
+ we might want to do this.
-static FRAME current_frame;
+ Typically called from FRAME_CHAIN_VALID.
+
+ A PC of zero is always considered to be the bottom of the stack. */
+
+int
+inside_main_func (pc)
+CORE_ADDR pc;
+{
+ if (pc == 0)
+ return 1;
+ if (symfile_objfile == 0)
+ return 0;
+
+ /* If the addr range is not set up at symbol reading time, set it up now.
+ This is for FRAME_CHAIN_VALID_ALTERNATE. I do this for coff, because
+ it is unable to set it up and symbol reading time. */
+
+ if (symfile_objfile -> ei.main_func_lowpc == INVALID_ENTRY_LOWPC &&
+ symfile_objfile -> ei.main_func_highpc == INVALID_ENTRY_HIGHPC)
+ {
+ struct symbol *mainsym;
+
+ mainsym = lookup_symbol ("main", NULL, VAR_NAMESPACE, NULL, NULL);
+ if (mainsym && SYMBOL_CLASS(mainsym) == LOC_BLOCK)
+ {
+ symfile_objfile->ei.main_func_lowpc = BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym));
+ symfile_objfile->ei.main_func_highpc = BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym));
+ }
+ }
+ return (symfile_objfile -> ei.main_func_lowpc <= pc &&
+ symfile_objfile -> ei.main_func_highpc > pc);
+}
+
+/* Test a specified PC value to see if it is in the range of addresses
+ that correspond to the process entry point function. See comments
+ in objfiles.h for why we might want to do this.
+
+ Typically called from FRAME_CHAIN_VALID.
+
+ A PC of zero is always considered to be the bottom of the stack. */
+
+int
+inside_entry_func (pc)
+CORE_ADDR pc;
+{
+ if (pc == 0)
+ return 1;
+ if (symfile_objfile == 0)
+ return 0;
+#if CALL_DUMMY_LOCATION == AT_ENTRY_POINT
+ /* Do not stop backtracing if the pc is in the call dummy
+ at the entry point. */
+/* FIXME: Won't always work with zeros for the last two arguments */
+ if (PC_IN_CALL_DUMMY (pc, 0, 0))
+ return 0;
+#endif
+ return (symfile_objfile -> ei.entry_func_lowpc <= pc &&
+ symfile_objfile -> ei.entry_func_highpc > pc);
+}
+
+/* Info about the innermost stack frame (contents of FP register) */
+
+static struct frame_info *current_frame;
+
+/* Cache for frame addresses already read by gdb. Valid only while
+ inferior is stopped. Control variables for the frame cache should
+ be local to this module. */
-/*
- * Cache for frame addresses already read by gdb. Valid only while
- * inferior is stopped. Control variables for the frame cache should
- * be local to this module.
- */
struct obstack frame_cache_obstack;
/* Return the innermost (currently executing) stack frame. */
-FRAME
+struct frame_info *
get_current_frame ()
{
- /* We assume its address is kept in a general register;
- param.h says which register. */
-
+ if (current_frame == NULL)
+ {
+ if (target_has_stack)
+ current_frame = create_new_frame (read_fp (), read_pc ());
+ else
+ error ("No stack.");
+ }
return current_frame;
}
void
set_current_frame (frame)
- FRAME frame;
+ struct frame_info *frame;
{
current_frame = frame;
}
-FRAME
+/* Create an arbitrary (i.e. address specified by user) or innermost frame.
+ Always returns a non-NULL value. */
+
+struct frame_info *
create_new_frame (addr, pc)
- FRAME_ADDR addr;
+ CORE_ADDR addr;
CORE_ADDR pc;
{
- struct frame_info *fci; /* Same type as FRAME */
+ struct frame_info *fi;
+ char *name;
- fci = (struct frame_info *)
+ fi = (struct frame_info *)
obstack_alloc (&frame_cache_obstack,
sizeof (struct frame_info));
/* Arbitrary frame */
- fci->next = (struct frame_info *) 0;
- fci->prev = (struct frame_info *) 0;
- fci->frame = addr;
- fci->next_frame = 0; /* Since arbitrary */
- fci->pc = pc;
+ fi->next = NULL;
+ fi->prev = NULL;
+ fi->frame = addr;
+ fi->pc = pc;
+ find_pc_partial_function (pc, &name, (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ fi->signal_handler_caller = IN_SIGTRAMP (fi->pc, name);
#ifdef INIT_EXTRA_FRAME_INFO
- INIT_EXTRA_FRAME_INFO (fci);
+ INIT_EXTRA_FRAME_INFO (0, fi);
#endif
- return fci;
+ return fi;
}
-/* Return the frame that called FRAME.
- If FRAME is the original frame (it has no caller), return 0. */
+/* Return the frame that called FI.
+ If FI is the original frame (it has no caller), return 0. */
-FRAME
+struct frame_info *
get_prev_frame (frame)
- FRAME frame;
+ struct frame_info *frame;
{
- /* We're allowed to know that FRAME and "struct frame_info *" are
- the same */
return get_prev_frame_info (frame);
}
-/* Return the frame that FRAME calls (0 if FRAME is the innermost
+/* Return the frame that FRAME calls (NULL if FRAME is the innermost
frame). */
-FRAME
+struct frame_info *
get_next_frame (frame)
- FRAME frame;
+ struct frame_info *frame;
{
- /* We're allowed to know that FRAME and "struct frame_info *" are
- the same */
return frame->next;
}
-/*
- * Flush the entire frame cache.
- */
+/* Flush the entire frame cache. */
+
void
flush_cached_frames ()
{
obstack_free (&frame_cache_obstack, 0);
obstack_init (&frame_cache_obstack);
- current_frame = (struct frame_info *) 0; /* Invalidate cache */
+ current_frame = NULL; /* Invalidate cache */
+ select_frame (NULL, -1);
+ annotate_frames_invalid ();
}
-/* Return a structure containing various interesting information
- about a specified stack frame. */
-/* How do I justify including this function? Well, the FRAME
- identifier format has gone through several changes recently, and
- it's not completely inconceivable that it could happen again. If
- it does, have this routine around will help */
+/* Flush the frame cache, and start a new one if necessary. */
-struct frame_info *
-get_frame_info (frame)
- FRAME frame;
+void
+reinit_frame_cache ()
{
- return frame;
+ flush_cached_frames ();
+
+ /* FIXME: The inferior_pid test is wrong if there is a corefile. */
+ if (inferior_pid != 0)
+ {
+ select_frame (get_current_frame (), 0);
+ }
}
/* If a machine allows frameless functions, it should define a macro
frame_info for the frame, and FRAMELESS should be set to nonzero
if it represents a frameless function invocation. */
-/* Return nonzero if the function for this frame has a prologue. Many
+/* Return nonzero if the function for this frame lacks a prologue. Many
machines can define FRAMELESS_FUNCTION_INVOCATION to just call this
function. */
int
frameless_look_for_prologue (frame)
- FRAME frame;
+ struct frame_info *frame;
{
CORE_ADDR func_start, after_prologue;
- func_start = (get_pc_function_start (frame->pc) +
- FUNCTION_START_OFFSET);
+ func_start = get_pc_function_start (frame->pc);
if (func_start)
{
+ func_start += FUNCTION_START_OFFSET;
after_prologue = func_start;
+#ifdef SKIP_PROLOGUE_FRAMELESS_P
+ /* This is faster, since only care whether there *is* a prologue,
+ not how long it is. */
+ SKIP_PROLOGUE_FRAMELESS_P (after_prologue);
+#else
SKIP_PROLOGUE (after_prologue);
+#endif
return after_prologue == func_start;
}
+ else if (frame->pc == 0)
+ /* A frame with a zero PC is usually created by dereferencing a NULL
+ function pointer, normally causing an immediate core dump of the
+ inferior. Mark function as frameless, as the inferior has no chance
+ of setting up a stack frame. */
+ return 1;
else
/* If we can't find the start of the function, we don't really
know whether the function is frameless, but we should be able
return 0;
}
+/* Default a few macros that people seldom redefine. */
+
#if !defined (INIT_FRAME_PC)
#define INIT_FRAME_PC(fromleaf, prev) \
prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) : \
prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
#endif
+#ifndef FRAME_CHAIN_COMBINE
+#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
+#endif
+
/* Return a structure containing various interesting information
about the frame that called NEXT_FRAME. Returns NULL
if there is no such frame. */
struct frame_info *
get_prev_frame_info (next_frame)
- FRAME next_frame;
+ struct frame_info *next_frame;
{
- FRAME_ADDR address;
+ CORE_ADDR address = 0;
struct frame_info *prev;
int fromleaf = 0;
+ char *name;
/* If the requested entry is in the cache, return it.
Otherwise, figure out what the address should be for the entry
if (!next_frame)
{
+#if 0
+ /* This screws value_of_variable, which just wants a nice clean
+ NULL return from block_innermost_frame if there are no frames.
+ I don't think I've ever seen this message happen otherwise.
+ And returning NULL here is a perfectly legitimate thing to do. */
if (!current_frame)
{
error ("You haven't set up a process's stack to examine.");
}
+#endif
return current_frame;
}
{
FRAMELESS_FUNCTION_INVOCATION (next_frame, fromleaf);
if (fromleaf)
- address = next_frame->frame;
+ address = FRAME_FP (next_frame);
}
#endif
return 0;
address = FRAME_CHAIN_COMBINE (address, next_frame);
}
+ if (address == 0)
+ return 0;
prev = (struct frame_info *)
obstack_alloc (&frame_cache_obstack,
prev->next = next_frame;
prev->prev = (struct frame_info *) 0;
prev->frame = address;
- prev->next_frame = prev->next ? prev->next->frame : 0;
+ prev->signal_handler_caller = 0;
+
+/* This change should not be needed, FIXME! We should
+ determine whether any targets *need* INIT_FRAME_PC to happen
+ after INIT_EXTRA_FRAME_INFO and come up with a simple way to
+ express what goes on here.
+
+ INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame
+ (where the PC is already set up) and here (where it isn't).
+ INIT_FRAME_PC is only called from here, always after
+ INIT_EXTRA_FRAME_INFO.
+
+ The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the PC
+ value (which hasn't been set yet). Some other machines appear to
+ require INIT_EXTRA_FRAME_INFO before they can do INIT_FRAME_PC. Phoo.
+
+ We shouldn't need INIT_FRAME_PC_FIRST to add more complication to
+ an already overcomplicated part of GDB. gnu@cygnus.com, 15Sep92.
+
+ Assuming that some machines need INIT_FRAME_PC after
+ INIT_EXTRA_FRAME_INFO, one possible scheme:
+
+ SETUP_INNERMOST_FRAME()
+ Default version is just create_new_frame (read_fp ()),
+ read_pc ()). Machines with extra frame info would do that (or the
+ local equivalent) and then set the extra fields.
+ SETUP_ARBITRARY_FRAME(argc, argv)
+ Only change here is that create_new_frame would no longer init extra
+ frame info; SETUP_ARBITRARY_FRAME would have to do that.
+ INIT_PREV_FRAME(fromleaf, prev)
+ Replace INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC. This should
+ also return a flag saying whether to keep the new frame, or
+ whether to discard it, because on some machines (e.g. mips) it
+ is really awkward to have FRAME_CHAIN_VALID called *before*
+ INIT_EXTRA_FRAME_INFO (there is no good way to get information
+ deduced in FRAME_CHAIN_VALID into the extra fields of the new frame).
+ std_frame_pc(fromleaf, prev)
+ This is the default setting for INIT_PREV_FRAME. It just does what
+ the default INIT_FRAME_PC does. Some machines will call it from
+ INIT_PREV_FRAME (either at the beginning, the end, or in the middle).
+ Some machines won't use it.
+ kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
+
+#ifdef INIT_FRAME_PC_FIRST
+ INIT_FRAME_PC_FIRST (fromleaf, prev);
+#endif
#ifdef INIT_EXTRA_FRAME_INFO
- INIT_EXTRA_FRAME_INFO(prev);
+ INIT_EXTRA_FRAME_INFO(fromleaf, prev);
#endif
/* This entry is in the frame queue now, which is good since
- FRAME_SAVED_PC may use that queue to figure out it's value
- (see m-sparc.h). We want the pc saved in the inferior frame. */
+ FRAME_SAVED_PC may use that queue to figure out its value
+ (see tm-sparc.h). We want the pc saved in the inferior frame. */
INIT_FRAME_PC(fromleaf, prev);
+ /* If ->frame and ->pc are unchanged, we are in the process of getting
+ ourselves into an infinite backtrace. Some architectures check this
+ in FRAME_CHAIN or thereabouts, but it seems like there is no reason
+ this can't be an architecture-independent check. */
+ if (next_frame != NULL)
+ {
+ if (prev->frame == next_frame->frame
+ && prev->pc == next_frame->pc)
+ {
+ next_frame->prev = NULL;
+ obstack_free (&frame_cache_obstack, prev);
+ return NULL;
+ }
+ }
+
+ find_pc_partial_function (prev->pc, &name,
+ (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ if (IN_SIGTRAMP (prev->pc, name))
+ prev->signal_handler_caller = 1;
+
return prev;
}
CORE_ADDR
get_frame_pc (frame)
- FRAME frame;
+ struct frame_info *frame;
{
- struct frame_info *fi;
- fi = get_frame_info (frame);
- return fi->pc;
+ return frame->pc;
}
#if defined (FRAME_FIND_SAVED_REGS)
/* Find the addresses in which registers are saved in FRAME. */
void
-get_frame_saved_regs (frame_info_addr, saved_regs_addr)
- struct frame_info *frame_info_addr;
+get_frame_saved_regs (frame, saved_regs_addr)
+ struct frame_info *frame;
struct frame_saved_regs *saved_regs_addr;
{
- FRAME_FIND_SAVED_REGS (frame_info_addr, *saved_regs_addr);
+ FRAME_FIND_SAVED_REGS (frame, *saved_regs_addr);
}
#endif
struct block *
get_frame_block (frame)
- FRAME frame;
+ struct frame_info *frame;
{
- struct frame_info *fi;
CORE_ADDR pc;
- fi = get_frame_info (frame);
-
- pc = fi->pc;
- if (fi->next_frame != 0)
- /* We are not in the innermost frame. We need to subtract one to
- get the correct block, in case the call instruction was the
- last instruction of the block. If there are any machines on
- which the saved pc does not point to after the call insn, we
- probably want to make fi->pc point after the call insn anyway. */
+ pc = frame->pc;
+ if (frame->next != 0 && frame->next->signal_handler_caller == 0)
+ /* We are not in the innermost frame and we were not interrupted
+ by a signal. We need to subtract one to get the correct block,
+ in case the call instruction was the last instruction of the block.
+ If there are any machines on which the saved pc does not point to
+ after the call insn, we probably want to make frame->pc point after
+ the call insn anyway. */
--pc;
return block_for_pc (pc);
}
get_pc_function_start (pc)
CORE_ADDR pc;
{
- register struct block *bl = block_for_pc (pc);
+ register struct block *bl;
register struct symbol *symbol;
- if (bl == 0 || (symbol = block_function (bl)) == 0)
+ register struct minimal_symbol *msymbol;
+ CORE_ADDR fstart;
+
+ if ((bl = block_for_pc (pc)) != NULL &&
+ (symbol = block_function (bl)) != NULL)
{
- register int misc_index = find_pc_misc_function (pc);
- if (misc_index >= 0)
- return misc_function_vector[misc_index].address;
- return 0;
+ bl = SYMBOL_BLOCK_VALUE (symbol);
+ fstart = BLOCK_START (bl);
+ }
+ else if ((msymbol = lookup_minimal_symbol_by_pc (pc)) != NULL)
+ {
+ fstart = SYMBOL_VALUE_ADDRESS (msymbol);
+ }
+ else
+ {
+ fstart = 0;
}
- bl = SYMBOL_BLOCK_VALUE (symbol);
- return BLOCK_START (bl);
+ return (fstart);
}
/* Return the symbol for the function executing in frame FRAME. */
struct symbol *
get_frame_function (frame)
- FRAME frame;
+ struct frame_info *frame;
{
register struct block *bl = get_frame_block (frame);
if (bl == 0)
cache_pc_function_name = (char *)0;
}
-/* Finds the "function" (text symbol) that is smaller than PC
- but greatest of all of the potential text symbols. Sets
- *NAME and/or *ADDRESS conditionally if that pointer is non-zero.
- Returns 0 if it couldn't find anything, 1 if it did. On a zero
- return, *NAME and *ADDRESS are always set to zero. On a 1 return,
- *NAME and *ADDRESS contain real information. */
+/* Finds the "function" (text symbol) that is smaller than PC but
+ greatest of all of the potential text symbols. Sets *NAME and/or
+ *ADDRESS conditionally if that pointer is non-null. If ENDADDR is
+ non-null, then set *ENDADDR to be the end of the function
+ (exclusive), but passing ENDADDR as non-null means that the
+ function might cause symbols to be read. This function either
+ succeeds or fails (not halfway succeeds). If it succeeds, it sets
+ *NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
+ If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero
+ and returns 0. */
int
-find_pc_partial_function (pc, name, address)
+find_pc_partial_function (pc, name, address, endaddr)
CORE_ADDR pc;
char **name;
CORE_ADDR *address;
+ CORE_ADDR *endaddr;
{
struct partial_symtab *pst;
struct symbol *f;
- int miscfunc;
+ struct minimal_symbol *msymbol;
struct partial_symbol *psb;
+ struct obj_section *sec;
if (pc >= cache_pc_function_low && pc < cache_pc_function_high)
+ goto return_cached_value;
+
+ /* If sigtramp is in the u area, it counts as a function (especially
+ important for step_1). */
+#if defined SIGTRAMP_START
+ if (IN_SIGTRAMP (pc, (char *)NULL))
{
- if (address)
- *address = cache_pc_function_low;
- if (name)
- *name = cache_pc_function_name;
- return 1;
+ cache_pc_function_low = SIGTRAMP_START (pc);
+ cache_pc_function_high = SIGTRAMP_END (pc);
+ cache_pc_function_name = "<sigtramp>";
+
+ goto return_cached_value;
}
+#endif
+ msymbol = lookup_minimal_symbol_by_pc (pc);
pst = find_pc_psymtab (pc);
if (pst)
{
+ /* Need to read the symbols to get a good value for the end address. */
+ if (endaddr != NULL && !pst->readin)
+ {
+ /* Need to get the terminal in case symbol-reading produces
+ output. */
+ target_terminal_ours_for_output ();
+ PSYMTAB_TO_SYMTAB (pst);
+ }
+
if (pst->readin)
{
- /* The information we want has already been read in.
- We can go to the already readin symbols and we'll get
- the best possible answer. */
+ /* Checking whether the msymbol has a larger value is for the
+ "pathological" case mentioned in print_frame_info. */
f = find_pc_function (pc);
- if (!f)
+ if (f != NULL
+ && (msymbol == NULL
+ || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
+ >= SYMBOL_VALUE_ADDRESS (msymbol))))
{
- return_error:
- /* No available symbol. */
- if (name != 0)
- *name = 0;
- if (address != 0)
- *address = 0;
- return 0;
+ cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_name = SYMBOL_NAME (f);
+ goto return_cached_value;
}
-
- cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
- cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
- cache_pc_function_name = SYMBOL_NAME (f);
- if (name)
- *name = cache_pc_function_name;
- if (address)
- *address = cache_pc_function_low;
- return 1;
- }
-
- /* Get the information from a combination of the pst
- (static symbols), and the misc function vector (extern
- symbols). */
- miscfunc = find_pc_misc_function (pc);
- psb = find_pc_psymbol (pst, pc);
-
- if (!psb && miscfunc == -1)
- {
- goto return_error;
}
- if (psb
- && (miscfunc == -1
- || (SYMBOL_VALUE_ADDRESS (psb)
- >= misc_function_vector[miscfunc].address)))
+ else
{
- /* This case isn't being cached currently. */
- if (address)
- *address = SYMBOL_VALUE_ADDRESS (psb);
- if (name)
- *name = SYMBOL_NAME (psb);
- return 1;
+ /* Now that static symbols go in the minimal symbol table, perhaps
+ we could just ignore the partial symbols. But at least for now
+ we use the partial or minimal symbol, whichever is larger. */
+ psb = find_pc_psymbol (pst, pc);
+
+ if (psb
+ && (msymbol == NULL ||
+ (SYMBOL_VALUE_ADDRESS (psb)
+ >= SYMBOL_VALUE_ADDRESS (msymbol))))
+ {
+ /* This case isn't being cached currently. */
+ if (address)
+ *address = SYMBOL_VALUE_ADDRESS (psb);
+ if (name)
+ *name = SYMBOL_NAME (psb);
+ /* endaddr non-NULL can't happen here. */
+ return 1;
+ }
}
}
- else
- /* Must be in the misc function stuff. */
+
+ /* Not in the normal symbol tables, see if the pc is in a known section.
+ If it's not, then give up. This ensures that anything beyond the end
+ of the text seg doesn't appear to be part of the last function in the
+ text segment. */
+
+ sec = find_pc_section (pc);
+
+ if (!sec)
+ msymbol = NULL;
+
+ /* Must be in the minimal symbol table. */
+ if (msymbol == NULL)
{
- miscfunc = find_pc_misc_function (pc);
- if (miscfunc == -1)
- goto return_error;
+ /* No available symbol. */
+ if (name != NULL)
+ *name = 0;
+ if (address != NULL)
+ *address = 0;
+ if (endaddr != NULL)
+ *endaddr = 0;
+ return 0;
}
- {
- if (misc_function_vector[miscfunc].type == mf_text)
- cache_pc_function_low = misc_function_vector[miscfunc].address;
- else
- /* It is a transfer table for Sun shared libraries. */
- cache_pc_function_low = pc - FUNCTION_START_OFFSET;
- }
- cache_pc_function_name = misc_function_vector[miscfunc].name;
- if (miscfunc < misc_function_count && 1 /* FIXME mf_text again? */ )
- cache_pc_function_high = misc_function_vector[miscfunc+1].address;
+ cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
+ cache_pc_function_name = SYMBOL_NAME (msymbol);
+
+ /* Use the lesser of the next minimal symbol, or the end of the section, as
+ the end of the function. */
+
+ if (SYMBOL_NAME (msymbol + 1) != NULL
+ && SYMBOL_VALUE_ADDRESS (msymbol + 1) < sec->endaddr)
+ cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + 1);
else
- cache_pc_function_high = cache_pc_function_low + 1;
+ /* We got the start address from the last msymbol in the objfile.
+ So the end address is the end of the section. */
+ cache_pc_function_high = sec->endaddr;
+
+ return_cached_value:
if (address)
*address = cache_pc_function_low;
if (name)
*name = cache_pc_function_name;
+ if (endaddr)
+ *endaddr = cache_pc_function_high;
return 1;
}
-/* Find the misc function whose address is the largest
- while being less than PC. Return its index in misc_function_vector.
- Returns -1 if PC is not in suitable range. */
+/* Return the innermost stack frame executing inside of BLOCK,
+ or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */
-int
-find_pc_misc_function (pc)
- register CORE_ADDR pc;
+struct frame_info *
+block_innermost_frame (block)
+ struct block *block;
{
- register int lo = 0;
- register int hi = misc_function_count-1;
- register int new;
-
- /* Note that the last thing in the vector is always _etext. */
- /* Actually, "end", now that non-functions
- go on the misc_function_vector. */
-
- /* Above statement is not *always* true - fix for case where there are */
- /* no misc functions at all (ie no symbol table has been read). */
- if (hi < 0) return -1; /* no misc functions recorded */
-
- /* trivial reject range test */
- if (pc < misc_function_vector[0].address ||
- pc > misc_function_vector[hi].address)
- return -1;
-
- /* Note that the following search will not return hi if
- pc == misc_function_vector[hi].address. If "end" points to the
- first unused location, this is correct and the above test
- simply needs to be changed to
- "pc >= misc_function_vector[hi].address". */
- do {
- new = (lo + hi) >> 1;
- if (misc_function_vector[new].address == pc)
- return new; /* an exact match */
- else if (misc_function_vector[new].address > pc)
- hi = new;
- else
- lo = new;
- } while (hi-lo != 1);
+ struct frame_info *frame;
+ register CORE_ADDR start;
+ register CORE_ADDR end;
- /* if here, we had no exact match, so return the lower choice */
- return lo;
+ if (block == NULL)
+ return NULL;
+
+ start = BLOCK_START (block);
+ end = BLOCK_END (block);
+
+ frame = NULL;
+ while (1)
+ {
+ frame = get_prev_frame (frame);
+ if (frame == NULL)
+ return NULL;
+ if (frame->pc >= start && frame->pc < end)
+ return frame;
+ }
}
-/* Return the innermost stack frame executing inside of the specified block,
- or zero if there is no such frame. */
+/* Return the full FRAME which corresponds to the given CORE_ADDR
+ or NULL if no FRAME on the chain corresponds to CORE_ADDR. */
-FRAME
-block_innermost_frame (block)
- struct block *block;
+struct frame_info *
+find_frame_addr_in_frame_chain (frame_addr)
+ CORE_ADDR frame_addr;
{
- struct frame_info *fi;
- register FRAME frame;
- register CORE_ADDR start = BLOCK_START (block);
- register CORE_ADDR end = BLOCK_END (block);
+ struct frame_info *frame = NULL;
+
+ if (frame_addr == (CORE_ADDR)0)
+ return NULL;
- frame = 0;
while (1)
{
frame = get_prev_frame (frame);
- if (frame == 0)
- return 0;
- fi = get_frame_info (frame);
- if (fi->pc >= start && fi->pc < end)
+ if (frame == NULL)
+ return NULL;
+ if (FRAME_FP (frame) == frame_addr)
return frame;
}
}
+#ifdef SIGCONTEXT_PC_OFFSET
+/* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */
+
+CORE_ADDR
+sigtramp_saved_pc (frame)
+ struct frame_info *frame;
+{
+ CORE_ADDR sigcontext_addr;
+ char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+ int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
+ int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
+
+ /* Get sigcontext address, it is the third parameter on the stack. */
+ if (frame->next)
+ sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ + FRAME_ARGS_SKIP
+ + sigcontext_offs,
+ ptrbytes);
+ else
+ sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
+ + sigcontext_offs,
+ ptrbytes);
+
+ /* Don't cause a memory_error when accessing sigcontext in case the stack
+ layout has changed or the stack is corrupt. */
+ target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
+ return extract_unsigned_integer (buf, ptrbytes);
+}
+#endif /* SIGCONTEXT_PC_OFFSET */
+
+#ifdef USE_GENERIC_DUMMY_FRAMES
+
+/*
+ * GENERIC DUMMY FRAMES
+ *
+ * The following code serves to maintain the dummy stack frames for
+ * inferior function calls (ie. when gdb calls into the inferior via
+ * call_function_by_hand). This code saves the machine state before
+ * the call in host memory, so we must maintain an independant stack
+ * and keep it consistant etc. I am attempting to make this code
+ * generic enough to be used by many targets.
+ *
+ * The cheapest and most generic way to do CALL_DUMMY on a new target
+ * is probably to define CALL_DUMMY to be empty, CALL_DUMMY_LENGTH to zero,
+ * and CALL_DUMMY_LOCATION to AT_ENTRY. Then you must remember to define
+ * PUSH_RETURN_ADDRESS, because no call instruction will be being
+ * executed by the target.
+ */
+
+static struct dummy_frame *dummy_frame_stack = NULL;
+
+/* Function: find_dummy_frame(pc, fp, sp)
+ Search the stack of dummy frames for one matching the given PC, FP and SP.
+ This is the work-horse for pc_in_call_dummy and read_register_dummy */
+
+char *
+generic_find_dummy_frame (pc, fp)
+ CORE_ADDR pc;
+ CORE_ADDR fp;
+{
+ struct dummy_frame * dummyframe;
+
+ if (pc != entry_point_address ())
+ return 0;
+
+ for (dummyframe = dummy_frame_stack; dummyframe != NULL;
+ dummyframe = dummyframe->next)
+ if (fp == dummyframe->fp || fp == dummyframe->sp)
+ /* The frame in question lies between the saved fp and sp, inclusive */
+ return dummyframe->regs;
+
+ return 0;
+}
+
+/* Function: pc_in_call_dummy (pc, fp)
+ Return true if this is a dummy frame created by gdb for an inferior call */
+
+int
+generic_pc_in_call_dummy (pc, fp)
+ CORE_ADDR pc;
+ CORE_ADDR fp;
+{
+ /* if find_dummy_frame succeeds, then PC is in a call dummy */
+ return (generic_find_dummy_frame (pc, fp) != 0);
+}
+
+/* Function: read_register_dummy
+ Find a saved register from before GDB calls a function in the inferior */
+
+CORE_ADDR
+generic_read_register_dummy (pc, fp, regno)
+ CORE_ADDR pc;
+ CORE_ADDR fp;
+ int regno;
+{
+ char *dummy_regs = generic_find_dummy_frame (pc, fp);
+
+ if (dummy_regs)
+ return extract_address (&dummy_regs[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE(regno));
+ else
+ return 0;
+}
+
+/* Save all the registers on the dummy frame stack. Most ports save the
+ registers on the target stack. This results in lots of unnecessary memory
+ references, which are slow when debugging via a serial line. Instead, we
+ save all the registers internally, and never write them to the stack. The
+ registers get restored when the called function returns to the entry point,
+ where a breakpoint is laying in wait. */
+
+void
+generic_push_dummy_frame ()
+{
+ struct dummy_frame *dummy_frame;
+ CORE_ADDR fp = (get_current_frame ())->frame;
+
+ /* check to see if there are stale dummy frames,
+ perhaps left over from when a longjump took us out of a
+ function that was called by the debugger */
+
+ dummy_frame = dummy_frame_stack;
+ while (dummy_frame)
+ if (dummy_frame->fp INNER_THAN fp) /* stale -- destroy! */
+ {
+ dummy_frame_stack = dummy_frame->next;
+ free (dummy_frame);
+ dummy_frame = dummy_frame_stack;
+ }
+ else
+ dummy_frame = dummy_frame->next;
+
+ dummy_frame = xmalloc (sizeof (struct dummy_frame));
+ dummy_frame->pc = read_register (PC_REGNUM);
+ dummy_frame->sp = read_register (SP_REGNUM);
+ dummy_frame->fp = fp;
+ read_register_bytes (0, dummy_frame->regs, REGISTER_BYTES);
+ dummy_frame->next = dummy_frame_stack;
+ dummy_frame_stack = dummy_frame;
+}
+
+/* Function: pop_dummy_frame
+ Restore the machine state from a saved dummy stack frame. */
+
+void
+generic_pop_dummy_frame ()
+{
+ struct dummy_frame *dummy_frame = dummy_frame_stack;
+
+ /* FIXME: what if the first frame isn't the right one, eg..
+ because one call-by-hand function has done a longjmp into another one? */
+
+ if (!dummy_frame)
+ error ("Can't pop dummy frame!");
+ dummy_frame_stack = dummy_frame->next;
+ write_register_bytes (0, dummy_frame->regs, REGISTER_BYTES);
+ free (dummy_frame);
+}
+
+/* Function: frame_chain_valid
+ Returns true for a user frame or a call_function_by_hand dummy frame,
+ and false for the CRT0 start-up frame. Purpose is to terminate backtrace */
+
+int
+generic_frame_chain_valid (fp, fi)
+ CORE_ADDR fp;
+ struct frame_info *fi;
+{
+ if (PC_IN_CALL_DUMMY(FRAME_SAVED_PC(fi), fp, fp))
+ return 1; /* don't prune CALL_DUMMY frames */
+ else /* fall back to default algorithm (see frame.h) */
+ return (fp != 0
+ && fi->frame INNER_THAN fp
+ && !inside_entry_file (FRAME_SAVED_PC(fi)));
+}
+
+/* Function: get_saved_register
+ Find register number REGNUM relative to FRAME and put its (raw,
+ target format) contents in *RAW_BUFFER.
+
+ Set *OPTIMIZED if the variable was optimized out (and thus can't be
+ fetched). Note that this is never set to anything other than zero
+ in this implementation.
+
+ Set *LVAL to lval_memory, lval_register, or not_lval, depending on
+ whether the value was fetched from memory, from a register, or in a
+ strange and non-modifiable way (e.g. a frame pointer which was
+ calculated rather than fetched). We will use not_lval for values
+ fetched from generic dummy frames.
+
+ Set *ADDRP to the address, either in memory on as a REGISTER_BYTE
+ offset into the registers array. If the value is stored in a dummy
+ frame, set *ADDRP to zero.
+
+ To use this implementation, define a function called
+ "get_saved_register" in your target code, which simply passes all
+ of its arguments to this function.
+
+ The argument RAW_BUFFER must point to aligned memory. */
+
+void
+generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+ char *raw_buffer;
+ int *optimized;
+ CORE_ADDR *addrp;
+ struct frame_info *frame;
+ int regnum;
+ enum lval_type *lval;
+{
+ CORE_ADDR addr;
+ struct frame_saved_regs fsr;
+
+ if (!target_has_registers)
+ error ("No registers.");
+
+ /* Normal systems don't optimize out things with register numbers. */
+ if (optimized != NULL)
+ *optimized = 0;
+
+ if (addrp) /* default assumption: not found in memory */
+ *addrp = 0;
+
+ /* Note: since the current frame's registers could only have been
+ saved by frames INTERIOR TO the current frame, we skip examining
+ the current frame itself: otherwise, we would be getting the
+ previous frame's registers which were saved by the current frame. */
+
+ while (frame && ((frame = frame->next) != NULL))
+ {
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ {
+ if (lval) /* found it in a CALL_DUMMY frame */
+ *lval = not_lval;
+ if (raw_buffer)
+ memcpy (raw_buffer,
+ generic_find_dummy_frame (frame->pc, frame->frame) +
+ REGISTER_BYTE (regnum),
+ REGISTER_RAW_SIZE (regnum));
+ return;
+ }
+
+ FRAME_FIND_SAVED_REGS(frame, fsr);
+ if (fsr.regs[regnum] != 0)
+ {
+ if (lval) /* found it saved on the stack */
+ *lval = lval_memory;
+ if (regnum == SP_REGNUM)
+ {
+ if (raw_buffer) /* SP register treated specially */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
+ fsr.regs[regnum]);
+ }
+ else
+ {
+ if (addrp) /* any other register */
+ *addrp = fsr.regs[regnum];
+ if (raw_buffer)
+ read_memory (fsr.regs[regnum], raw_buffer,
+ REGISTER_RAW_SIZE (regnum));
+ }
+ return;
+ }
+ }
+
+ /* If we get thru the loop to this point, it means the register was
+ not saved in any frame. Return the actual live-register value. */
+
+ if (lval) /* found it in a live register */
+ *lval = lval_register;
+ if (addrp)
+ *addrp = REGISTER_BYTE (regnum);
+ if (raw_buffer)
+ read_register_gen (regnum, raw_buffer);
+}
+#endif /* USE_GENERIC_DUMMY_FRAMES */
+
void
_initialize_blockframe ()
{
projects / deliverable / binutils-gdb.git / blobdiff